I've been parsing a few threads related to this and thought that I would chime in.
Home Inspectors are a joke. They have tried to credential themselves out of being a joke but they are still a joke.
PE's who have no specific familiarity with residential construction are somewhat less of a joke but are still a bad joke.
AIA guys are sort of like PE guys, if they do not have a background in residential. These guys can really be an expensive joke.
"Designers" are the biggest joke of all and they have several subsets, all of whom have credentialing entities behind them. Some are kitchen designers, some are just general designers, most of them call themselves "Interior Designers" and they all suck.
Inspectors are a really, really bad joke. In the old days these jobs were filled by retired builders and carpenters. That was fine. They shouldn't have changed it. Now we have young'uns who quote the code without understanding. I don't like them.
But they have credentials.
Regards, Tom.
Thos. J. Watson - Cabinetmaker